Will Roundcube still be a seperated project or will it be included in Nextcloud? If they integrate it to heavily in the Nextcloud stuff I won't be using it anymore. :-)
I don't think so, as then Web Hosting Panels would loose out. But, you never know.
We'll look what users want, what's best for the ecosystem etc, but we're not looking to kill it and if we ever would, it won't be for the money.